Reply to sound layers

hello all! just wanted to say in like 3 days ive learned more here than anywhere else and this community is pretty bad ass!!!

onto my question. ive been working on this track
http://www.youtube.com/watch?v=oHQeEzqunhM

everyone that hears it says to layer the sounds or that it needs more layers. what exactly does that mean. im guessing to make the sounds more full???